Sparking plug with automatic cleaning means for internal combustion engines



Mamh 1934. E. E. JUNOD-SCHUBERT 1,952,948

SPARKING PLUG WITH AUTOMATIC CLEANING MEANS FOR INTERNAL COMBUSTION ENGINES Filed June 5. 1931 Patented Mar. 27, 1934 UNITED STATES PATENT OFFICE ENGINES Edmond Edouard Junod-Schubert, Ste.-Crix, Vaud, Switzerland Application June 3, 1931, Serial No. 541,892 In Switzerland May '7, 1930 1 Claim.

This invention relates toimprovements in spark plugs, the object of the invention being to effect such improvements in the construction of a spark plug as to prevent the accumulation of carbon between the electrodes and thereby greatly enhance the efficiency of the spark plug. To this end there is provided a chamber for the electrode, which on one side causes the electric spark to be elongated and on the other hand, owing to its form deflects the igniting spark only towards the cylinder, so that a considerable caloric effect is prevented towards the interior of the spark plug. With the above and other objects in view, the invention consists in the construction, combination and arrangement of devices hereinafter described and claimed.

In the accompanying drawing Figure l is a side elevation of a spark plug constructed in accordance with this invention.

Figure 2 is an inverted plan of the same. Figure 3 is a longitudinal section. Figure 4 is a cross section on line IV-IV of Figure 1.

My improved spark plug comprises a metallic body 1 which forms the external pole or electrode and which terminates in a chamber 2 which is substantially closed at the lower end and has an upwardly contracted neck to form a deflector and is provided with spaced openings 18, 19. 30 The exterior of the body is provided with screw threads adapting it to be screwed into the wall 3 of the motor cylinder in which the spark plug is to be used. A washer 4 of copper or other suitable material is placed between the cylinder and 35 the spark plug. The upper part of the body 1 of the plug is hexagonal to enable it to be readily gripped by a wrench to effect the screwing of the plug into the cylinder.

The inner part of the body 1 is bored out apart from the washer 10 and serves to receive the central electrode '7, the insulating member 6 whereof, which is usually porcelain, fits exactly into the conical boring of the body 1. The upper part of the insulating body 6 is clamped into a tubular part 8, the under collar or flange 9 whereof fits on the body 1, the entrance of oil or gas being prevented by the washer 10. The middle electrode 7, after being exactly regulated within the body 1 of the screw 11, is fixed in its exact position by screwing down. The upper part of the electrode 7 is also provided with insulating discs 12 of mica, for example, and on the threaded end fits a nut 13 for the compressing of the said discs. There is further provided a nut 15 for attaching an insulated closing cover 14, on

the washer 16 of which is clamped a cable which is connected to the magnet inductor.

The lower end 17 of the electrode '7 is left blank. It is bent in a hook like form and is prolonged so as to enter into the chamber 2. Before fastening it by the screw 11, the electrode is so oriented that its free end is placed immediately opposite to the aperture 18 or 19 which apertures are provided within the inclined surfaces of the Wall of the chamber 2. The inclined surfaces form together an angle of The stuffing assures to the spark plug a perfect isolation and avoids the penetration of oil to the middle electrode.

The automatic cleaning device is formed by the cooperation of the following elements: The defiector 20 between the chamber 2 and the body 1, the chamber 2 with its apertures 18, 19 and the hook like bent electrode 17. Hence an absolutely sure exhausting of such combustion gases is obtained as could for any reason remain within the chamber 2.

During the compression within the motor cylinder the carbureted gas is introduced by pressure into the chamber 2 through the apertures 18, 19. At ignition, the spark formed between the hook I? and one of the openings 18, 19 ignites the gaseous mixture within the chamber 2, which violently blows out the entire content through the apertures 18, 19, at the same time lengthening the flame, while the deflector 20 prevents the burning of the insulating end of the electrode 17. Thus not only all oil which could enter the chamber 2 is evacuated, but the ignition flame or spark blown out through the apertures l8, l9 1 assumes an elongated form which vigorously ignites the gaseous mixture within the cylinder and greatly facilitates the operation of the motor in which the spark plug is used. The spark plug is simple in construction and may be readily manufactured at low cost.

I claim:

In a spark plug a body having a chamber substantially closed at the lower end and an upwardly contracted neck at the upper end to form a deflector, and provided with spaced openings extending through the closure at the lower end and a centrally arranged electrode having a hook shaped terminal extending through the contracted neck and into said chamber and slightly spaced from the wall and bottom of the chamher and arranged with its terminal end opposite one of the openings.

EDMOND EDOUARD J UNOD-SCHUBERT 

